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Initial commit of Command & Conquer Renegade source code.

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LFeenanEA
2025-02-27 16:39:46 +00:00
parent 74ab8fa5e0
commit 58ed459113
4918 changed files with 1366710 additions and 0 deletions
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Code/wwlib/rc4.cpp Normal file
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/*
** Command & Conquer Renegade(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//
// rc4.cpp
// RC4 encryption / decryption
//
#include "rc4.h"
#include <memory.h>
static unsigned char RC4_Temp_Byte;
#define RC4_SWAP_BYTE(a,b) RC4_Temp_Byte=a; a=b; b=RC4_Temp_Byte
//
// Don't rely on this to zero the key
//
RC4Class::RC4Class()
{
memset(Key.State, 0, 256);
Key.X=0;
Key.Y=0;
}
//
// Setup the encryption key. This must be called before you encrypt/decrypt!
//
void RC4Class::Prepare_Key(const unsigned char *key_data_ptr, int key_data_len)
{
unsigned char index1;
unsigned char index2;
unsigned char *state;
int counter;
state = &Key.State[0];
for (counter = 0; counter < 256; counter++)
state[counter] = (unsigned char)counter;
Key.X = 0;
Key.Y = 0;
index1 = 0;
index2 = 0;
for (counter = 0; counter < 256; counter++) {
index2 = (unsigned char)(key_data_ptr[index1] + state[counter] + index2);
RC4_SWAP_BYTE(state[counter], state[index2]);
index1 = (unsigned char)((index1 + 1) % key_data_len);
}
}
//
// RC4 in standard mode.
//
// This will XOR the buffer with the RC4 stream (like a one time pad).
//
void RC4Class::RC4(unsigned char *buffer_ptr, int buffer_len)
{
unsigned char x;
unsigned char y;
unsigned char *state;
int counter;
x = Key.X;
y = Key.Y;
state = &Key.State[0];
for (counter = 0; counter < buffer_len; counter++) {
x++;
y = (unsigned char)(y + state[x]);
RC4_SWAP_BYTE(state[x], state[y]);
buffer_ptr[counter] ^= state[(state[x] + state[y]) & 255];
}
Key.X = x;
Key.Y = y;
}